Incidence – A cancer incidence rate is the number of new cancers of a specific site/type occurring in a specified population during a year, usually expressed as the number of cancers per 100,000 population at risk. That is,

Incidence rate = (New cancers / Population) × 100,000
The numerator of the incidence rate is the number of new cancers; the denominator is the size of the population.

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Mortality – A cancer mortality rate is the number of deaths, with cancer as the underlying cause of death, occurring in a specified population during a year. Cancer mortality is usually expressed as the number of deaths due to cancer per 100,000 population. That is,

Mortality Rate = (Cancer Deaths / Population) × 100,000

The numerator of the mortality rate is the number of deaths; the denominator is the size of the population.